What is "quercitron"

Quercitrin \Quer"cit*rin\, n. [Cf. F. quercitrin. See Quercitron.] (Chem.) A glucoside extracted from the bark of the oak ( Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron.

n. 1 A yellow dye obtained from the bark of the black oak. 2 The black oak tree, (taxlink Quercus velutina species noshow=1), indigenous to North America.

1. n. a yellow dye made from the bark of the quercitron oak tree

2. medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad 5-lobed leaves are bristle-tipped [syn: black oak, yellow oak, quercitron oak, Quercus velutina]

Quercitron is a yellow natural dye obtained from the bark of the Eastern Black Oak (Quercus velutina), a forest tree indigenous in North America. The name is a shortened form of quercicitron, from Latin quercus, oak, and citron, lemon, and was invented by Edward Bancroft (1744–1821), who by act of parliament in 1785 was granted special privileges in regard to the importation and use of the substance. The dyestuff is prepared by grinding the bark in mills after it has been freed from its black epidermal layer, and sifting the product to separate the fibrous matter, the fine yellow powder which remains forming the quercitron of commerce. The ruddy-orange decoction of quercitron contains quercitannic acid, whence its use in tanning, and an active dyeing principle, quercitrin, CHO. The latter substance is a glycoside, and in aqueous solution under the influence of mineral acids it yields quercetin, CHO, which is precipitated, and the methyl- pentose rhamnose.

Quercetin is a crystalline powder of a brilliant citron yellow color, entirely insoluble in cold water and dissolving only sparingly in hot water, but quite soluble in alcohol. Either by itself or in some form of its glucoside quercitrin, quercetin is found in several vegetable substances, among others in cutch, in Persian berries ( Rhamnus cathartica), buckwheat leaves (Fagopyrum esculentum), Zante fustic wood (Rhus cotinus), and in rose petals.

Chemically, quercetin is a member of a fairly extensive class of natural coloring matters derived from phenyl benzoyl-pyrone or flavone, the constitution of which followed on the researches of St von Kostanecki, A. G. Perkin, Herzig, Goldschmidt and others. Among the related, coloring matters are: chrysin from poplar buds, apigenin from parsley, luteolin from weld, mignonette and dyer's broom, fisetin from young fustic and yellow cypress, galangin from galangal root, and myricetin from Nageia nagi.